Suspended Floor Structure for Reducing Structure-borne Sound of Interior Noise

Abstract

As part of a study to reduce the interior noise of railway vehicles, RTRI investigated the vibration characteristics of a bullet train-type vehicle body. The vertical vibration of the side structural panels was found to be smaller than that of the floor panels. Thus, to reduce the structure-borne sound from the bogie, RTRI invented a suspended floor structure in which the floor panels were suspended from the side structural panels. Several prototypes were fabricated in the test vehicle and excitation tests were conducted with the vehicle stationary. The results showed reduced level of radiated sound power from the floor panel.